to get lost with too much, but it's outweighed. otherwise, they'll never have it. restaurants, hotels, routinely delete these recordings after a couple of days or a week. they've got to get it now, preserve it and eventually, they'll get to it. >> we just got new news tonight through nbc, sourcing telling nbc that the triggers mechanism on the devices, while that may not have been the world's most sfes kated bombs, they may have been more sfes kated than previously led to believe. is that important? >> i think it's mostly because circuit boards could be more easily traceable than other components. ball bearings, they're pretty common. backpacks, maybe similarly so, but circuit boards generally so some signatures that you can track back to a specific item where it was made and purchased.